GSTDTAP  > 气候变化
DOI10.1002/joc.4703
Low-frequency oscillations of East Asia/Pacific teleconnection and simultaneous weather anomalies/extremes over eastern Asia
Chen, Yang1,2; Zhai, Panmao1; Li, Lei1
2017
发表期刊INTERNATIONAL JOURNAL OF CLIMATOLOGY
ISSN0899-8418
EISSN1097-0088
出版年2017
卷号37期号:1
文章类型Article
语种英语
国家Peoples R China
英文摘要

The East Asia/Pacific (EAP) teleconnection can substantially modulate weather anomalies over eastern Asia during summer. Wavelet analyses, including ensemble mean power spectrum and accumulated frequency of significant components, highlight 10-30-day oscillations in the EAP index. The influences of these low-frequency oscillations on weather anomalies are further investigated via both phase-dependent and lead-lag composites. On 10-30-day scales, a tripole structure of precipitation anomalies and a temperature seesaw form concurrently over adjacent regions along eastern Asia. These anomalies last for about 1week, constituting anomalous weather spells with possible extreme values around the peak/valley phases. For cold spells over Northeast Asia during positive phases, the low-frequency easterly is the determinant factor. On one hand, it advects cold air from the sea east of the land. On the other hand, it conveys moisture to form low-based clouds, which are effective in inhibiting incoming solar radiation. While, for cold spells over central-eastern Siberia during negative phases, regional-scale precipitation and cold advections conveyed by anomalous northerlies combine to make contributions. Both hot spells over central-eastern Siberia/Northeast Asia during positive/negative phases mainly result from the adiabatic heating and increasing solar radiation, both of which are attributed to strong descent in response to upper-level convergences. In addition to great intensity, the high-impact property of these simultaneous weather anomalies also arises from their long duration and large spatial extent. By taking advantages of the quasi-periodicity of the 10-30-day oscillations, better predictions of these simultaneous weather anomalies/extremes would be anticipated.


英文关键词East Asia/Pacific teleconnection low-frequency oscillations simultaneous weather anomalies duration weather extremes
领域气候变化
收录类别SCI-E
WOS记录号WOS:000392415700021
WOS关键词WESTERN NORTH PACIFIC ; NORTHEASTERN UNITED-STATES ; COOL-SEASON PRECIPITATION ; SHEARED ZONAL FLOW ; LARGE-SCALE FLOW ; SUMMER MONSOON ; INTRASEASONAL OSCILLATION ; EQUATORIAL WAVES ; ATLANTIC OSCILLATION ; CLIMATE VARIABILITY
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/36658
专题气候变化
作者单位1.CMA, Chinese Acad Meteorol Sci, State Key Lab Severe Weather, 46 South Ave, Beijing, Peoples R China;
2.Nanjing Univ Informat Sci & Technol, Dept Atmospher Sci, Nanjing, Jiangsu, Peoples R China
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GB/T 7714
Chen, Yang,Zhai, Panmao,Li, Lei. Low-frequency oscillations of East Asia/Pacific teleconnection and simultaneous weather anomalies/extremes over eastern Asia[J]. INTERNATIONAL JOURNAL OF CLIMATOLOGY,2017,37(1).
APA Chen, Yang,Zhai, Panmao,&Li, Lei.(2017).Low-frequency oscillations of East Asia/Pacific teleconnection and simultaneous weather anomalies/extremes over eastern Asia.INTERNATIONAL JOURNAL OF CLIMATOLOGY,37(1).
MLA Chen, Yang,et al."Low-frequency oscillations of East Asia/Pacific teleconnection and simultaneous weather anomalies/extremes over eastern Asia".INTERNATIONAL JOURNAL OF CLIMATOLOGY 37.1(2017).
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